Question for EE (electrical engineering) folks - Computers, Math ...

I am not an electrical engineer, and I may be wrong, but I've heard it is either impossible or too expensive/difficult to make a battery which can be recharged so it will discharge a precise voltage. In other words, when you put it in a charger and then use it, it may output a slightly different voltage than intended. There's a certain amount of "wiggle room" in the end result. Thus, I believe it's essentially a design decision - if the precise output may vary, to keep it low enough to avoid any possibility of causing harm to the devices the batteries are used in. (Too low a voltage may cause problems in a few cases, but is not likely except under incredibly unusual circumstances to result in damage - even a slight overvoltage will damage some delicate components.)

For that matter, batteries may be officially rated at 1.5 volts - but I've tested brand new batteries whose output fell as low as 1.3 volts... And the voltmeter I used was accurate enough I have no reason to doubt it. I've never tested onewhich put out too high a voltage - again, I presume manufacturers are more careful to avoid the scenario which would result in their product causing damage.
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